Accelerometer and gyroscope

Topics to be discussed

What ?Where ?Application?Types?How ?

Simple Application to Gaming:

• Aim: To control paddle via accelerometer

• Accelerometer serves as a wireless joystick

GYROSCOPE

Topics to be discussed

• What ?• Uses ?• Application ?• Types?

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What is a Gyroscope?

• Device used to measure or maintain orientation

• Works on the principals of angular momentum• Initial axis of rotation is conserved

• Consists of a spinning mass on an axel

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Common UsesGyrocompass• Used by ships to find true north• Seeks minimum potential energy

Stability Assistance• Hubble Space Telescope• Bicycles

Inertial Guidance System• Guided Missiles• Measure angular velocity in inertial reference frame• Detect changes to orientation• Combined with accelerometer for 6 axis sensor

Practical application

• A gyroscope is a device that contain a disc rotating on an axis that can turn freely in any direction ,so that the disc maintain the same position .

• This device can greatly improve the stability of the helicopter

Types of Gyroscopes• Rotary gyroscope

– Rotor suspended in a gambol spins independently in order to conserve angular momentum

– Mostly unused in modern systems

• Fiber optic gyroscope (FOG)– Fiber optic coil determines changes in orientation by path of

light in the coil– Beam traveling against rotation has slightly shorter path

• Microelectromechanical systems (MEMS)– Uses very small vibrating mechanism to detect changes

• Consumer Electronics

• Wii Remote• Tilt, yaw, pitch• Rate of angular movement

• Smart Phones• Gaming Input• Screen Orientation

• Laptops• Free fall detection 18

Gyro Sensor Applications

Used in measuring the amount of motion itself.Ex.) Checking athletic movement

Sense the amount of angular velocity produced.

Senses angular velocity produced by the sensor's own movement. Angles are detected via integration operations by a CPU.

The angle moved is fed to and reflected in an application.Ex.) Car navigation systemsGame controllersCellular